【单项选择题】
You executed the following command in Recovery Manager （RMAN）： <br /> RMAN> RESTORE CONTROLFILE； <br /> Which operation must you perform before this command is executed？（） <p> You executed the following command in Recovery Manager （RMAN）： <br /> RMAN> RESTORE CONTROLFILE； <br /> Which operation must you perform before this command is executed？（） </p>
A、A.back up the control file to trace
B、B.bring database to the MOUNT state
C、C.open a connection to the RMAN recovery catalog， which contains the RMAN metadata for the target database
D、D.set the database ID （DBID）， but only if the DB_NAME parameter associated with the target database is unique in the recovery catalog
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